19-year-old, Nikolas Cruz, accused of gunning down 17 people at his former school Marjory Stoneman Douglas, has admitted his role in the crime.

During the interrogation, Cruz revealed that he "entered the school campus armed with an AR-15 and began shooting students that he saw in the hallway and on the school grounds," according to CNN.

"Cruz stated that he brought additional loaded magazines to the school campus and kept them hidden in a backpack until he got on campus to begin his assault," a probable cause report on the attack stated.

According to CNN, the Florida shooter also went to Walmart, bought a drink at a Subway in the store, went to a McDonald's and then left on foot prior to being taken into custody.

Cruz's attorney told local media that he is on a suicide watch.

Public defender Gordon Weekes called his 19-year-old client a "deeply disturbed, emotionally broken" young man who has struggled with significant mental illness and trauma his entire life.

"He's gone through a lot in a very short period of time and that does not minimize the loss of those families, but we have to put that into the proper light," CNN quoted Weekes as saying.

Cruz was booked on 17 counts of premeditated murder on Thursday.

According to local media, 15 people were injured.

Further, the leader of a white supremacist group on Thursday reportedly claimed that Cruz was a member of his group and also participated in paramilitary drills in Tallahassee, according to reports.

However, Cruz's defense attorneys say he shows signs of autism and appears to be suffering from mental illness .

“We have a strong belief that his mental illness will be a significant issue in the case and is a significant issue in how we got to this point,” said Gordon Weekes, one of Broward’s chief assistant public defenders and a member of the defense team.

ANI